The Carrera RS was introduced in 1973 as a lightened and modified 911 S, built by Porsche to qualify for FIA’s Group 4 GT/Special Sports Car racing series category. With this model, the Carrera name would be reborn from the 356 Carrera inspired by the Carrera Panamericana races in Mexico in the 1950s. Compared to a standard 911S of the same period, the Carrera RS had a larger 2.7 Liter engine developing 210 hp, mechanical fuel injection, race-ready suspension, a ducktail rear spoiler, larger brakes, along with wider rear wheels and fenders. Two versions were offered: the Lightweight/Sport option M471 was the racing-oriented basis for the RSR, while the Touring option, package M472, retained much of the interior trim and features of the standard car.